Student Login

Home›Chapters›Ray Optics PYQs›Combination of Lenses›Question 33

MHT CET 2023 (11 May, Shift 2) · Combination of Lenses

Combination of Lenses question from MHT CET 2023 (11 May, Shift 2)

Q33MHT CET 2023 · 11 MAY · SHIFT 2Easy

Combination of Lenses

A double convex lens of focal length ' $F$ ' is cut into two equal parts along the vertical axis. The focal length of each part will be

Show answer and solution

Answer: (a)

The cut (perpendicular to the axis) leaves each part plano-convex.
$\frac{1}{F} = (\mu-1)\frac{2}{R}$ , half: $\frac{1}{F'} = (\mu-1)\frac{1}{R} = \frac{1}{2F}$
So the answer is (a) $2F$ .

Report a mistake

More questions on Combination of Lenses

A bi convex lens of focal length 10 cm is cut in two identical parts along a plane…JEE Main 2023 (13 Apr, Shift 2)
A combination of two thin lenses in contact have power +10 D. The power reduces to +6 D…MHT CET 2023 (14 May, Shift 1)
Two convex lenses of focal length 20 cm each are placed coaxially with a separation of 60…JEE Main 2023 (12 Apr, Shift 1)
A point object, 'O' is placed in front of two thin symmetrical coaxial convex lenses L₁…JEE Main 2023 (10 Apr, Shift 2)
As shown in the figure, a combination of a thin plano concave lens and a thin plano…JEE Main 2023 (24 Jan, Shift 1)
An object is placed on the principal axis of convex lens of focal length 10cm as shown. A…JEE Main 2023 (25 Jan, Shift 2)
In the figure shown here, what is the equivalent focal length of the combination of…NEET 2023
A convex lens of focal length 20 cm is placed in front of a convex mirror with principal…JEE Main 2022 (25 Jul, Shift 2)